Validator joining flow

[JesseAbram]

Core

• [x] Set parameters for size of signer group and T of N
• [x] Add Signer groups to chain
• [x] Get randomness to select new signer from validators on session refresh
• [x] Rotate Signers
• [x] Create ocw message to do reshare
• [x] Allow nodes to call in to confirm (holding new key share in seperate storage slot)
• [x] On confirmation have chain update new signers
• [x] When all confirmed (or T idk) create another message to rotate new keyshare to old keyshare, delete old keyshare #968
• [x] Validate new_reshare pathway
• [x] Delete old key if not a new signer (includes making the test for reshare in TSS actually rotate the signers not just do a reshare)
• [x] Replace SIGNING_PARTY_SIZE to TOTAL_SIGNERS or SIGNER_THRESHOLD

Extras

• [x] Have next_signers and signers bounded by T and N in parameters
• [x] Store current threshold info with verifying key onchain
• [ ] Add checks to what a signer needs to have before selected (balance etc) #998
• [ ] Have a signature or something in confirming reshare done correctly #981
• [x] Determine how initial signers are selected and set parameter bound on configs (should be in jumpstart)
• [ ] Do not allow validator unbonding if they are a signer #942
• [x] Refactor reshare to be more resuable (reshare and refresh pathways should be mostly the same
• [x] Add test for new signer without key added to network (currently they all have keys

[JesseAbram]

first four handled in #938

[JesseAbram]

As all of the task still left are open for input, have been pulled out to their own issues and as I would consider them enhancements I am closing this as done